The apartment looks old, the walls are cracked and dirty. Things are falling apart. A little plaster and a coat of paint would do wonders. Better mattresses and breathable linen are definitely required. The bathroom smelled like sewers.
There are also Too many rules.
The apartment is small, except for that one main bedroom; but overall cosy. Not a great choice if it rains or if you plan to spend quite a bit of time indoors. There's just no room to move comfortably. And no comfortable seating.
I was traveling with my mom. We spent most of the day outside just roaming the streets, canals and islands of Venice. So we didn't spend too much time in the apartment.
The owner doesn't want you to use the A/C (although it gets super humid in the apartment throughout the night - I woke up frequently, sweating. It's not hot, just humid!!!).
Note the neighbors upstairs are noisy and they knocked on the floors a couple of times our last evening because we were watching a movie (and it got louder when there were action scenes). They clearly preferred bothering us ALL evening (by constantly moving/dragging furniture around and walking with heels) then being bothered a few minutes at a time for 1 hour and 39 minutes!
Cool area, walkable to just about everything.
So I give it a "low 4 star" rating , just because it's still a good option, not cheap, but one of the lower costs in the area. The host was responsive enough, and my traveling partner would give it 4-stars.